However I don't know which username to use: I tried with admin and postgresql but neither worked.

I introduced the password I set up when installing bitnami as per the instructions.

I went to Control Panel -> Administrative Tools -> Computer Management. There under "Local Users and Groups" to see all users created for your system and I'm only seeing: Administrator, Guest and my name (not postgresql user)

I also tried to open the pg-hba.conf file and set up host all all 127.0.0.1/32 trust

to be able to access with any user and I cannot access.

Thank you very much

Also would like to know if there is any way to change username, password, etc for postgresql

I am not able to login to postgres, giving error as Password Authentication failed for user "postgress".I downloaded Bitnami virtual machine and trying to use postgresql.Please someone help I am not able to work on this.Or suggest me any other way to work on Postgresql.